The less uncertainty there is, the less restrictions you need to impose using an expression. Lowering the amount of uncertainty helps. Technically speaking, could exist, so who are we to say it doesn't based on just a Regular Expression? Specific Email Addresses Though, even the most robust, complex email address validation expressions fail on this - they're there to validate the form, not whether the email exists. In conclusion, this is a rough sketch: characters) Additionally, the second string needs to contain a dot, which has an additional 2-3 characters after that. What does an email address entail? It has to have a symbol, as well as some string preceding it, and some string proceeding it. Whether this is a good thing or not is debatable.

RFC 5322 - Internet Message Format, covering 99.9% of email addressesĪfter many attempts at validating with robust Regular Expressions, many engineers fall back to the good old 'general' format that works most of the time.

General format - Specific hosts or domains - referring to a specific type of domain, or top-level domain.

We'll cover the most general regular expressions for validating email, as well as those which are more specific in the guide.īefore we get into the code, let's preview the email formats that we will be looking into: It's surprisingly a loose definition, as we'll shortly see - and you can go simple or robust on this. When validating emails, or really any input, a good practice, which can more or less guarantee that the user will match the RegEx, is to limit the user input upfront.įor example, mandatory usage of or and straight-up rejecting the non-supported providers (though, you do run into the issue of scalability and staying up-to-date with this approach). However, the one that matches 99.9%, does. If you aren't familiar with Regular Expressions and would like to learn more - read our Guide to Regular Expressions and Matching Strings in JavaScript! Matching Email Formats in JavaScript with Regular Expressionsįirst and foremost, a regular expression that matches all the possible valid email addresses doesn't exist.

JS Graphics JS Graphics JS Canvas JS Plotly JS Chart.js JS Google Chart JS D3.For the rest of the guide, we will assume that you are somewhat familiar with Regular Expressions. JS vs jQuery jQuery Selectors jQuery HTML jQuery CSS jQuery DOM

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